The present invention relates to an apparatus for preventing overcharge of a battery, and more particularly, to an apparatus for preventing overcharge of a battery, which interrupts power of the battery by inducing a fracture of a busbar to prevent overcharge and to this end, provided is an apparatus for preventing overcharge of a battery, including: a battery cell; an electrode tab extended from both sides of the battery cell and constituted by a negative tab and a positive tab; and a busbar connecting the negative tab and the positive tab, wherein the busbar has a cut part fractured by expansion of the battery cell.